Resilient wheel tire



May `1.8l 1926. 1,584,785

'C'. D. MccLLouGH RESILIENT WHEEL TIRE Patented May 13, 1926.

l) 5 lTED ST 'rss CHARLES D. IVICCOLLUGI-I, 0F DES MOINES, 10V-IA, ASSIGNOR, BY DXRECT AND MESNE ASSIGNMENTS, TO HIMSELF, E. F. LEWIS, AND GEORGE W. LEWIS, BOTH OF CAM- BRIDGE, IOWA.

BESILIENT WHEEL TIRE.

i Application filed September An object of this invention is to provide an improved resilient and elastic tire for vehicle wheels.

A further objectof this inventionl is to provide an improved molded resilient and elastic tire for vehicle wheels, which is formed with a substantially uniform displacement of its materialcontent throughout lits circumference, whereby practically uniform resilience and compressibility are produced circumferentially of the tire.

A. further object of this invention is to provide an improved molded resilient and elastic tire for vehicle wheels, which tire is formed with apertures on its'lateral sides to increase its resilience, said apertures coni municating circumferentially to permit circumferential displacement of air therein during travel of the tire.

A lfurtlnar object of this invention is to provide-an improved construction for a rim' adapted to contain and be carried by ya tire having apertures in kits lateral sides.

My inventionconsists in the construction, arrangement and combination of elements hereinafter set forth, pointed out in the claims and illustrated by the accompanying drawing, in which- Figurel is a side elevation of my improved tire and rim combined, a portion of the rim being broken away to reveal interior construction. Figure 2 is a cross-section, on an enlarged scale, on the indicated line 2-2 of Figure 1 Figure 3 tion, on a further enlarged scale, of a por-` tion of the rim and Figure 4f is a longitudinal section, or inside elevation, ofthe parts shown in Figure 3.

ln the construction ofthe devices as shown the numeral'l() designates the base or radiallyl inner portion of a tire and 11 designates the tread or radially outer portion ofthe same tire, which preferably is molded, in annular form and.` of homogeneous character, from a single material such as rubber, or other suitable material' snch as synthetic or salvaged rubber or a combination of any such single material with reinforcing, bonding or strengthening material or materials, having y greater' or less inherent. resilient properties'. The homogeneous or composite tires, hav'ng the base 10 and tread 11,',ii1ay de any suitable dimensi s ac laptA *11am ineen whe-elem,

isV a cross-sec-y ative te the cava-,ies and are:

4, 1923. `Serial 110,660,795.

The base 10 preferably is substantially rectangular in cross-section and an annular groove 12, of slight depth, may provide demarlation between said base and the tread portion 11 on each or either side of the tire. The base 10 is formed-with a series or annue lar row of apertures or cavities 13, 14 in one of its lateral sides and, also, is formed with a similar row of apertures or cavities 15, 16 in the other of its lateral sides. tures 13 and 15 are of substantially uniform size and dimension and preferably each is, in cross-section, the shape of an equilateral or other isosceles triangle having its base arranged toward and falling in an arc concentric with and of less radius than the outer circumference of the annulus of said base, and one of its apices directed toward and falling within an arc concentric with and of less radius than the center of said annu-y lus, the latter arc preferably being adjacent to the innermost annular surface of the tire. Each of the apertures or cavities 13 and 15 extends from a lateral surface of the base 10 to the median line thereof, wholly falls within the annular space between the two intermediate arcs above noted and the aper tures 13 are staggered relative to the apertures 15 and overlap them so as to produce triangular holes 17 on the median line of the tire, which holes each have anv area of substantially one-fourth the cross-section of one of said vapertures or cavities. The apertures or cavities 14C-and 16 are of substantially uniform size and dimension and preferably each f is, in cross-section, the shape of an isosceles triangle having a shorter base than the cavities 13 and 15. The cavities 111 and 16 are arranged between and'inverted relative to the cavities 13 and 15 in their annular rows, being arranged so that the base of each cavity 14 or 16 falls in the arc occupied by the' innermost apices of the alternating cavities and Vthe voutermost apices of said cavities 14 and 16 fall in the arc occupied by the bases of saidalternating cavities. Each 'of the apertures orcavities 14 and 16 extends from a lateral surface of the base 10 substantially 4to but Vnot beyondl the median line thereof,

wholly falls within the ,space between the jtinvo' intermediate arcs above noted andale terna-te vitlijthe cavities' and 14 respec= nd the cavities 1a are t gered rely there as to produce triangular holes 18 on the inediaii line ot the tire, which holes each have .airareaoi' substantially one-'fourth the cross- `lsection et oiieo't' said cavities llor'l. Thus two sets ot' spaced -`apertures are termed which extend entirely through and transversely ot' the base l0, as clearly, shown in Figure l, each ot said apertures 17,'18 being the shape ot an isosccles triangle. rElie-formation ot the various apertures increasethe coiiipressibility of the base and the resilience oit` tlieitii'e. -lt is apparent that the size and spacing et the apertures inaliv be. varied-inaccordaiice iwith tiieedegree of coiiipi'essibility and resilience desii'edffto be obtained, and the weights to -be iboi'iie; but the apertures on oneside should al ways be staggered lfrelatiive to and overlap the apertures on tlie'other sideto provide coniniunication between adjacent and successive apertures. When thel apertures are ai'- ianged close together as shown and described, it: is apparent that the displacement of rubber content of the base is substantially uniform atall pointsthroughout the circumference thereof, tliusassiiriiig substantialhv .uiii't'orm resilience andobviatingiobjectionable,bumping-effectl in use ofthe. tire. It is also .apparent that'byv reason ot the overlapping ofthe apertures and their staggered relatioini a siiiiious continuous' channel or open v.space is provided circunifterentially ot' the base, when said base is inclosedl'by' the rim as .hereinafterv described: 4Vlhus -displacement otair; in the aperture is permitted circuniterentially et the ybase as it-travels under .pressure ot a, load, which further -iiiereases the resilience and luniform compressibility of the lwhole tire. -The` tread portion il of the tire also isconipressible and elastio to .a degree and takes` tliewear andcoiitact oit the tire with tlieroad surface. It.

will be observed that the lapertures orv cavitiesf Otagiven row` are separatedfb),v ribslt) which. extend on.l inclined lines-across the space between the intermediate varcs above notec, said lines being tangential vto an are intermediate ,of the Iinner annular. surface ot the tireand ther center otasaidvtire, adiaeent ribsA being on vconverging fp-laiies. Thus the longitudinal plane .ot any rib. iis; at no Itimeperpendicular to` the roadway or treads'uitace. on which the :tire travels and the load is; applied at an angle to saidplane, thus increasingthepvfiexibility o t ,the vtiijeand 'avoidiiigiiiiui'ious buckling ot the ribs. a-Aii. an.

iiular metal rini base20 is provided, of an externalldiameter substantially equal to the internal diameter ot the .case l0 and plane= in cross-section. vThe rim baseQO is adapted to ybe mounted in any'suitable -niaiiner on a.:

vehicle wheel (notshown) and is formed with relatively'ivide integral flange 21 on and extending,radially troni one side niargin. The outer marginal portion of the tlangel is bent iiiwardliforming an annularlip Q2. The i'inrbase 2ll"also is "ioriiied vwith a relativel f narrow inteo'ral llaiio'e 2) oniand'eiitendiiig radially 'troni its side niar- 4gin"opfposite'vltoI thetlangel and an out- 'A'iiiet'a'l ring 25 is i'oriiied with an inwardly-opening iabbet on its inner margin adapted to fi't'tlie'iabbet 2l and said ring is also formed with semi-circular `notches at the base otl its'i'abbet adapted to register with similar seiiii-circiilar notches in the margin ol the flange Q3. Studs 26 (dotted lines Fig. l) ware'niounted -in the holes; :toi-ined by the mating 'notches in the llangc Q3 and ring, the heads olf said studs being on the inner suilace ot' 4said fiaiige andiing, and serve to prevent ciiciiiii'tei'e'iitial inovenient of the ring l'relative to the flange. Registering holes '27128 are lfoiiiied in the flange-21 and ring', respectively and are countersunl;from the outside surlace. rl`he outer marginal portion o't' the ring 5 is lient inwardliv totorni an annular lip The tire is mounted on the rim, when the ring is removed, bv manual force. the base lt) compressing sufiifcie'ntlli,Y lto enlarge the opening ot its aiiiiiillu's so that it will pass over the relatively narrow flange Q3: said base seating on the rin'i'bctwee'n the flanges. rl`hen the tire is adjusted cii'ciiiiilei'eiitiallv to register the holes-1S with the holes 2T in the fiaiig'e S21', the studs 264 are placed in the notches iii the flange" 23 'iv'iththeir heads toward the-base l0 and heldiby contact therewith, the riiig`25- is 'placed against the side oi the base with -its notches embracing the studs and its holes 28 registering with the holes 2T a'iid' 1 8.A liolt's Bt), having tapering heads 3l, are passed through the holesI 25%, 1.8 and QTin turn and ta'pe'riii'g'nuts 532 are mounted on the threaded ends olsaid bolts and tightened thereon'. The tapering heads 3l seat iiithe liolesQSvand the tapering nuts L-seatin the liole'sQT. AThe flanges il and areelamped together on opposite sides o l" the tire by the bolts SU andthe annular lips 22 and Qlengage and,compress` the tire at the juncture ot the' baseA l0 and tread portion l1, entering the grooves'll in such 'locations ortoriiiiirg such grooves by said compressionfI rllhe 'bolts 30"are clipped at. ltheir threaded 'ends' flush' with the outer Vfaces of thetapeiing nuts. The heads ilfand nuts 32. preferably 'are provided with spaced holes opening voutwardlyl and adapted to beI engaged@T afspaniier'ot' coniinoii 'forni (not'shoivn) whereby-tliebolt's can be retained 'against rotation wliile the nuts are rotated relative thereto. The flange 25 mai' be seated and the base compressed to permit such seating by the application thereto and use ot a vise or clamps ot common form to the extent ot permitting the application of loo Cil

the nuts to the bolts or theirI removal therefrom. While the bolts 30 constitute a desirable adjunct to the other devices shown in the matter of retaining the tire against rotation in the rim, yet such use is secondary; dependence principally being made on the gripping of the tire laterally under the clamping function of said bolts. The contact of the annular lips with the tire and the compression of said tire by the flanges is sufficient only to retain the tire in desirable location on and in the rim; but is not so great as to permit cutting of the tire by the lips nor to prevent compression of the base between the flanges as described in connection with the apertures and cavities in said base.

l claim as my inventionl. A resilient tire composed of an annular homogeneous body, said body being formed with two series only of apertures extending from its lateral sides to its median line, each of said apertures being of substantially isosceles triangular form in cross-section, the apertures on one side being staggered relative to and overlapping the apertures on the other side and alternate apertures in each series being inverted relative to the remain` ing apertures of said series whereby two rows of holes falling on concentric circles are formed across said median line.

2. A resilient tire composed of an annular homogeneous body having a base and a tread portion, said base being formed with two series only of apertures extending from its lateral sides to its median line, each of said apertures being of substantially isosceles triangular form in cross-section, the apertures on one side being staggered relative to and overlapping the apertures on the other side and alternate apertures in each sei'ies didering in size and being inverted relative to the remaining apertures of said series whereby two rows of holes falling on concentric circles are formed across said median line, all of said apertures falling wholly series only of apertures extending from its lateral sides to the median line, each of said apertures being of substantially isosceles triangular form in cross-section, the apertures on one side being staggered relative toand overlapping the apertures on the other side and alternate apertures in each series differing in size and being inverted relative to the remaining apertures of said series whereby two rows of holes falling on concentric circles are formed across said median line, all of said apertures falling wholly within an annular space defined by circles between and concentric with the radially outer and inner circumference of the tire.

4. A resilient tire coniprising a base portion adapted to be attached to a rim, and a tread portion, said tire being formed with two series only of apertures extending from its lateral sides substantially to but not crossing its median line, each of said apertures being of substantially isosceles triangular form in crossssection, the apertures on one side being staggered relative to and overlapping the apertures on the other side, and alternate apertures on each lside being arranged in inverted position relative to the others, whereby mathematically uniform displacement of material and consequent' resilience is obtained.

5. A resilient tire comprising a base portion adapted to be attached to a rim, and a tread portion, said tire being formed with two series only of apertures extending from its lateral sides substantially to but not crossing its median line, each of said aperturcs being of substantially isosceles triangular form in cross-section, the apertures on one side being staggered relative to and overlapping the apertures on the other side and alternate apertures on eaclrside differing in size and being inverted relative to the others, whereby mathematically uniformdisplacement of material and consequent uniform resilience is obtained. f

Signed at Des Moines, in the county of Polk and State of Iowa, this 26th day of January, 1922.

CHARLES D. lrlcCOLLOUGl-l. 

